<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .father {
      overflow: hidden;
      width: 400px;
      height: 400px;
      margin: 100px auto;
      background-color: deeppink;
      text-align: center;
    }

    .son {
      width: 200px;
      height: 200px;
      margin: 100px auto;
      background-color: skyblue;
      text-align: center;
    }
  </style>
</head>

<body>
  <div class="father">
    <div class="son">son盒子</div>
  </div>

  <script>
    var son = document.querySelector('.son');
    son.addEventListener('click', function (e) {
      alert('son');
      e.stopPropagation(); // stop停止 Propagation 传播
      e.cancelBubble = true; // 非标准 cancel 取消 bubble 泡泡
    }, false);
    var father = document.querySelector('.father');
    father.addEventListener('click', function () {
      alert('father');
    }, false);
    document.addEventListener('click', function () {
      alert('document');
    })
  </script>
</body>

</html>